MIDAS is an assembler made at MIT. It was originally made for the TX-0, ported over to the PDP-1, and then the PDP-6. It was used as the main assembler, indeed main programming language, in the PDP-10 Incompatible Timesharing System.
Syntactic elements:
| Syntax | Purpose |
|---|---|
| ; | Comment to end of line |
| ? | Starts a new statement on the same line |
| ^X | ASCII control character X |
| 'X | SIXBIT character X |
| "X | ASCII character X |
| ASCII/.../ | ASCII string |
| SIXBIT/.../ | SIXBIT string |
| (...) | Syntactical grouping, and halfword swapping |
| [...] | Syntactical grouping, and literals |
| <...> | Syntactical grouping |
| X" | Global symbol |
| X"Y | Symbol Y in block X |
| X' | Variable X |
| # | XOR operator |
| \ | OR operator |
| _ | Left shift operator |
Midas mode is licensed under the GPL v3, see COPYING.md.